1 Answer
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The issue seems to be due to a bug. To get around this issue you need to copy your wallpaper to /usr/share/backgrounds and then set the permissions to read only (there's 3 permissions sections, set the last two to read only and leave the first on as read/write). That should fix it. Make sure your folder containing the pictures isn't set so only your username can read the files. Set to anyone can read-only and it should work.